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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab1496efe9f19dc425be36401057d18499cb9f967e88c9b6c333ca9619801ec' 
  AND token = 'ALP1i4Kq2aGg84IKHWFSSMn7Hti1gXZoKbUwPM6BBgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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