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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a523b20ebedb3724d68626695e7b6c394ee374cdc251002b8915d20faa5a1f48' 
  AND token = 'wvrdLGYEQ3ixr8nUF7SvzizNL3XahQDf0LH+h1VQ52M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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