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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dceafd5529b467d82263130ae223fa144a7c1213a11fe4f46e69dc0b355924a' 
  AND token = 'SdMF6Ofh8RmE3x3yyXLgNtTrQpmsU8ybuzSCB5NxaQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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