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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1e5ce0145808284ca79fa99ac624e75e39b27dd76f88773c3ed8a2358190e7' 
  AND token = 'zPfgegcv9tSn9OVM3Zvkk9ERNa0u/d5Iw3eoM5IYvu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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