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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94de1cba104adce1f0561ea233f6b90f0a963ba605c38229b11484dc18362f3' 
  AND token = '9vMv8pyD2oL78k8xjanSOKzlQR5FnFQ3eSYplKMNicc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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