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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccf33c8c67da9706eb73992168fab33770fd0c30398b60ef13df00d6caeef62' 
  AND token = 'vdZaSGoNY4tHBLk2NxGlEc7c8YtBbX1q2Nz3DlhEhUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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