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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae2819d6dc5f1be244f099caa922b1e8f32e7b3cf0793501b8554457e42d52c' 
  AND token = 'CrtVeVbZF7hwalTCLdaepYE66Q8ZSzKZZYgp312qPQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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