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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde8800756c0e9354d9800d69a4163e0188160b90665e2f3f47f1fda5e607610' 
  AND token = '5EXuBuZvW/F7e9Z7f6DgooHTtICarbCOz4o4q4L6VyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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