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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970267af438a39d9b02eb0b211232a9d192f1b864797f8d43aaf4f9a8f1d94ce' 
  AND token = 'kd7puHpF7745aNiGE7o3hwc4wJSHzdcW0nf5TTXI6O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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