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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63e0909c12baf1f5c26c974ef962ed711dce52bb01c3671de51de7c9ed99293' 
  AND token = 'pWeJJtuXHqpxBx+P+OXiBtdnq4M556RW8+fnRQqisyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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