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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394fc7d6cd8975006955cd887960a49a8158ef72869cec249fed43a7c7e30ea0' 
  AND token = '2PBkPOIMV4X+42g1usq7TpP1iMH1ruByIAxt1xEcguA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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