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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718d2ff08e9c9bd8b3f41766a0b9cb21ea69177ee3db15841145adc6380bcb74' 
  AND token = 's+eTJ6q1icu2F0kxxXgDeHl0Y0cgxht2Ok5rrBAI8EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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