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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2fb13e3232d0f147f4df8949da516ade7bd0896966d8eb247339db77e921e0' 
  AND token = 'ljDivxGwkM6ugogpsdKJWNdMQCvkZIu/Q2PKd1Xa4GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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