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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1032b64d13050e084804a7a4fdd0ab167836b5f554ad2553d27201c6521dabae' 
  AND token = 'jHiM4bc1YnqbC/zlq8W0htBEn7mC8gQbZzkOA8cQO/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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