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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9d77c0e496d67f42fcbe84aba3a002e6bb5cfbcc9de609e1ca5dedb181d302' 
  AND token = 'DJVsK7pjYQl05JBVo1N8gMoEq48n/JItEsYNCTGxrXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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