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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34b921f388e68a926fc5b6a960afce4c24071866f76ad5be04377ac0edae522' 
  AND token = 'QmbG5JtsNb1jE24FJDV9K1Xxmmjkr4U6e7z0cEUtF9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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