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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1390ed2c5239fdea31e478b1049e4a7a10c84f17934b2d894b3cd2e8f3949e20' 
  AND token = 'o5ZQ5MlJvOe03+6CO2orCwQyW5Ggv9flFnxb4ZWsMrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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