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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cd0e943a624a4e5fc598846b526fcf8792319d1feee4ffd2aa6d339953e22c' 
  AND token = 'ut/38Fl+D8jfWIpvCZQ6X6ETP53Z++aiAnfTWR3/H6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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