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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83619b32bcdaa10575c64dc3ea3e3a659994931631e94f515ad7c7c796d2dd91' 
  AND token = 'ur79aTsCmtKic1Dv/T7onHZw3IAN5PSwZHs61MLy92w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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