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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcf38b16fdd8d402758cb4a2521e0fd390ca07396aa3b0d9ec6da0a37d19e09' 
  AND token = 'ObeGBv4tghe3QtTnK2d5+snLxTo4vD9kskV0LX49HYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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