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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb050be9948bcea542b73e725a4efde279e7dbdf71a5e7d23241c54280dd7fc' 
  AND token = 'Ak/gahAtKo5AQqFrUPWLzytbaS9TCYILfPunkPc5Tqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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