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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73940198e7467b00937ef0a6f2343deff43226c350dbd594ee39642cbc9e1b63' 
  AND token = 'DW/jmnQuU8qNCfAB42Mw8mrcF0Nfq47dvJFWj17CIAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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