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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c34980b2daf4f2a15d6df38bcd5d208bb6b7b7a61662ab9cafcdd574034d1ff' 
  AND token = 'X6cMr6G1d3QJySYZW6TY9GkmY2M3O/2McRZpd/6SLLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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