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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb2febefc0abda78ab6fa0df44bfd1617fd76508ed41d152d1dc636b26d5a5e' 
  AND token = 'fwPNfFk6g7sVrbxtj8C9rMOVBfXuq4NVguae3CEE5KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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