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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff60ce31bb5c97271d2cbf9a4979d9e62940975b7838f10d0343623f53d00be8' 
  AND token = 'm4XVTQDuuw7CtMvaL2GC8ZGs82tEC6C37sb6OPRIwws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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