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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664c14f1f85cfff16ef43ee69dddbe4d746d47c4c9b020dcb9c3235e5a99f0a9' 
  AND token = 'LGQoOb2TIzYv2UK0777LfJRU5bsuZsz9orsHSXtp90Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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