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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd091d0bf0830235e0e3a29fb355873ac6e5959fd0d81d24355987b02a1321659' 
  AND token = 'IvROHktHWWFNNFBquhWLEGR4BbT6kDqVP6UhstLxB9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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