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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9016b880a185b49c53bffb9f5285f87f95229db52695efd95689fbda2ff3f2f9' 
  AND token = 'K1oNidJi68q5ihNWVtl77U1Hr+6+RHuSqdXgQ1/WzpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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