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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1ccb0e205af1360e009be8ef1b4faa6dd8659f051d02f1e9af4c3be9dec3e9' 
  AND token = 'wMEQguerS4+uHZzoDQXX/VUgBXlB0M2qzsp60hWwmIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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