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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670f5cf21c8cab8c609201bab46e135a0185d428e1a72a3e69f5eafb8bd05b09' 
  AND token = '8satV7BlFHSMHsInUTOco9ySbMK3OZSYfJcvuVgI7RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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