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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e93f326e626b9a83d150711a2c903ecc3d0df4326eefcb2d451b516418ec71' 
  AND token = 'ee0Q1p2PZ7FJ+XaferVYHwikoVgTE6xu1Q6LI6QRnX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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