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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144011cf94ad58e24aff6d6d65752437e7f64c8ed01174cb07df427c1844a567' 
  AND token = 'VvUK8dctjLmLiniRns6ws92J7dF7AgkL8wpP2alTST8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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