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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f35f8d5b1bf9fc76821efae74798d83dc4d30fd0ac871fbeb93e6cef2b58d9' 
  AND token = 'DCkk6QQeLvUUne/1n4mJx4KIe/rZM+ZX8EEdaE6hdKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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