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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548fd0265a13947325d0e6c732745be7cfd9da1ee9f033630f9e2383f7d50610' 
  AND token = 'fnF7B6cR6N3DU/Kvjcf8gK70QvmxDZc4sTKshXvYSpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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