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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69267c2e3f1e0f5c392ff25384469608673c9aeaa8882e2f7a5d8015b78f45a2' 
  AND token = 'KRMUwK5Cq0YZOXWFaOwMGU3oxZy3FFrWAk8etptdHKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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