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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fb30c9026c4f349a03f7dc02e056d4b60188c6f81b507ae23b062eb7ed631c' 
  AND token = 'JqwSv18u52uHbu3YMbHC97FsYlXkivDA8klrenhTI+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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