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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896b8db92b5b4458b4f0f4d6f95a6988b85e9008184f53f1782ce4f559133f8b' 
  AND token = 'qIRUQFIpQlBKIU7rRXTu9QKAfmtWLr5wqqOYIBk3bbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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