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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0868c29d33d8269e93c7a3e29dfe96e3aabd14b7f6725e999ff9d2dbd92af912' 
  AND token = 'vKym+2dbWrvHdh/OHjZue/sc9TGQDdSBv2l78Gqn8tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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