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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bf2f8d029b7917c363ecddce127582e19f2fe1a53c3bab3cb3dc3cc78c5d8e' 
  AND token = 'pfyF+owp7+B0KlCaMxe4O8QqqtHIoOs/81WLxggsviI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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