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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cadbfb4c8f80e29b9623cb1b62bc8dce9c3d014fe7f266fe07863608d5b44764' 
  AND token = 'qb9l2PMuSTUKac+byxjsMVuWhyPg3moT4JR1vHoWjNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}