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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d04eda1e79bbddf70a2c867ac2a1b6aa11bfc319e872290acfba582b8f5c80c' 
  AND token = '2YQqXCoTb0wLyY4GVcG32oxRQe80Zbj9I2FjsBTCFxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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