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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da809d0578bced01db72ae62280b6e8eb799416ee24fe529751c82731c6cd9a4' 
  AND token = 'f2mI7p8391IX79sl2YMbInMFTg+1KX9u1H7vssPVtPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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