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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53656dbae67968e4c87359eb3f883c75c03bef4d95723a1b0919a94bb5a31d81' 
  AND token = 'tSJgkISKpLAOK9sgvJJ67bJbLeuVY1jvMYYc32gXD/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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