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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9308a2775b1501656032e55e3f459bb6fa9d2de195aca9c76033aa7845c0edc' 
  AND token = '8lms+DQfdatfkMXmoxYOSlUIS0d7os6I6CatkpYe0Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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