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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0da2a9ad60ba6f9ec605641f5ba63b60c551b3744513eb967ff13cf210c3d89' 
  AND token = 'YYnodCh5fmVY6rbrUcZX/5jCeQ8WM4E5lzgnJnrnaW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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