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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f792abeb82889e1b0d7709073d1e375bebf812489e4b83b9df786ed33713cef' 
  AND token = 'hh43Ck6ksqSq7uv+hoBpOXjP9PBJNJagEy2ogEHAA+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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