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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae5b0a9c430e35e8ce28f32a67ae0012e61ff0ffbe1f701518a2d5306d4b0df' 
  AND token = 'HtlBWCIW65ba9VZclpKZtSzdfmRWcqraxVodqXjpG8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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